The other day I tried the Pro Limit teamwave waist harness I bought 2 years ago and haven't broken in yet. The secret insider tip that prompted this was, wait for it...you don't wear a waist harness around your waist, you wear it on your hips! Did anybody else know this?????? Sheee-it....
So, I tried that, and I actually didn't get a bad back from wearing it this time!! Hurrah! One small step!

But I still need advice...the harness fits snugly around the hips, without creeping up too badly, but (a) when you're sailing hooked in, it really squashes the hips, I mean it's not exactly comfortable to use at all... and (b) although the harness stays put, the hook & spreader bar try to pull up really high, so I end up hanging from the thing in a really weird way. I had to abort and head back to the beach for my seat harness in order to salvage the rest of the session.
How do you guys manage to cope with this? Do you lower the boom waaay down so the harness lines are more horizontal when hooked in? They do say shorter harness lines are the go, but this would just add to the weird hanging problem.